When I purchased my new engine (4AGE) from a guy who used to Race Corolla GTS he gave me a TRD engine/suspension prep guide for the AW11 MR2. I believe it is from the old TRD catalog aroud 1990 maybe ?? It gives a brief history of the MR2 and the 4AGE as well as the 4AGZE.

The Catalog rates the MR2 in the various SCCA classes never giving it less than an "A" grade this being if all drivers were equal. It has a vehicle preparation section which lists mods in two phases. The first phase is titled Street performance. This section says 

Phase One: STREET PERFORMANCE:

Results: Slight decrease in ride quality, improved handling, improved brakind 10-15 hp increase.
 

• TRD Springs 
• TRD Adjustable Swaybars 
• TRD Low pressure gas strut inserts 
• TRD Brake pads 
• TRD Brake line kit (drain and install ford type fluid) 
• TRD Header and Exhaust System High Flow Air filter Recalibrate fuel injection system (See Engine Preparation Section)

• Reset alignment:
• Camber Front: -1 degree 
• Camber Rear : -1 "
• Caster : +6 "
• Toe in Front: 1/16 in. 
• Toe in rear : 1/8 in.

Phase Two: AUTO CROSS, STREET PERFORMANCE AND ROAD RACE (Dependent upon class restrictions)

RESULTS: Decrease in ride quality (lowers ride height 1.5-2 in.), dramatically improved handling, improved braking.

• Instead of phase one equipment:
• TRD High pressure gas stuts 
• TRD Springs
• Reset Alignment:
• Camber Front: -2 degrees 
• Camber Rear : -1 1/2 degrees
• Caster : +6 degrees
• Toe in front: 1/16 in. ( 1/8 in. out for auto cross) 
• Toe in rear : 1/8 in. ( 1/16 in. out for auto cross)

All phase one Modifications, Plus:

• TRD Urethane Bushings 
• Front and Rear strut tower braces 
• Negative camber blocks 
• Front and Rear adjustable camber kits 
• Engine Modifications ( see Engine Modifications section) 
• Light weight fly wheel 
• Heavy Duty Clutch 
• LSD 
• Performance Ratio Ring and pinion Set 
• Close ratio transmission gear set

I've got the part numbers for all those goodies listed above but I don't know if there still avalible or what they cost

Section 3.3 (Summary)

Engine Components: 4AG

"The bottom end of the 4AG has proven extremely reliable in all types of performance applications, and the stock connecting rods and crankshaft will withstand up to 170 hp and 8000 rpm. For applications where higher hp or rpm are desired, Carillo rods, our TRD billet crankshaft and dry sump lubrication is required."

"The original fuel injection system is capable of delivering suffucient fuel to support 140hp with only minor adjustments (see engine preperation section). Engines that develop over 170 hp will require larger injector nozzles."

4AG Engine Recommendations

Phase One: Street Performance

Results: Although there are no internal engine modifications, this phase is no emmisions legal. Modifications cause no reduction in low speed drivability and there is a 15-20% hp increase over a usable power range from 3000-6500 rpm.

• TRD Exhaust header and high flow exhaust Recalibration of fuel injection system (see engine preperation section) 
• TRD Spark plug wire Set
• TRD Adjustable camshaft gears

Phase Two: Street Performance, Rally, Road Race

Results: With no internal modifications or decrease in drivability, there is a increase of 25-30% hp increase over a usable power range of 3000-8000 rpm.

• TRD Exhaust header and high flow exhaust Recalibration of fuel injection system (see engine preperation section) 
• TRD Spark plug wire Set 
• TRD Adjustable camshaft gears 
• TRD Camshafts (272 duration intake 272 duration exhaust 7.5mm lift)

Phases 3-5 require internal modifications

4AGZ vs. 4AGE internal differences:

• Strengthened block 
• Dished forged pistons 
• Connecting rod journal diameter increased from 40mm - 42mm 
• Piston pin diameter increased from 18mm - 20mm

This Catalog also has listings for:
 

• Carbs Fuel injection modification kits (the second kit includes a potentiometer and wiring required to adjust the injector pulse.)
• 12 different cams with lift from 7.5mm - 10.7mm
• Short blocks with 12.7:1 compression ratios
• Oil pump gear set (high volume for stock pump) 
• Oil pan baffles(for stock pan) 
• 2 flywheels

One question for all of you modders out there does anyone out there have the Engine preperaton section with the fuel injection recalibraton section ??

Sorry for taking up so much space Ithught this might be of intrest to the other Mk1 owners. Any questions on part #'s email me directly. This wasn't the whole catalog just the parts that I thought would be applicable to this mailing list.

Dave McCristall 
Vancouver Canada 

Telephone 604 533-4098 Fax 604 533-7998